function [ lap ] = Deriv2Laplace( Ix,Iy )
%DERIV2LAPLACE Summary of this function goes here
%   Detailed explanation goes here
    
    %LAPLACIAN = d^2I/dx^2 + d^2I/dy^2
    lap = conv2(Ix, 0.5*[1 -1],'same') + conv2(Iy,0.5*[1 ; -1],'same');

end

